ethdb

Documentation

Index

• Constants
• Variables
• func FormatSegmentFilename(blockNumber uint64) string
• func KeyBlockNumber(key []byte) (num uint64, ok bool)
• func ParseSegmentFilename(filename string) (uint64, error)
• type Batch
  • func NewTableBatch(db Database, prefix string) Batch
• type Database
  • func NewTable(db Database, prefix string) Database
• type DatabaseSegment
  • func NewDatabaseSegment(blockNumber uint64, db Database) *DatabaseSegment
• type Deleter
• type LDBDatabase
  • func NewLDBDatabase(file string, cache int, handles int) (*LDBDatabase, error)
  • func (db *LDBDatabase) Close()
  • func (db *LDBDatabase) Delete(key []byte) error
  • func (db *LDBDatabase) Get(key []byte) ([]byte, error)
  • func (db *LDBDatabase) Has(key []byte) (bool, error)
  • func (db *LDBDatabase) LDB() *leveldb.DB
  • func (db *LDBDatabase) Meter(prefix string)
  • func (db *LDBDatabase) NewBatch() Batch
  • func (db *LDBDatabase) NewIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator
  • func (db *LDBDatabase) Path() string
  • func (db *LDBDatabase) Put(key []byte, value []byte) error
• type MemDatabase
  • func NewMemDatabase() *MemDatabase
  • func (db *MemDatabase) Close()
  • func (db *MemDatabase) Delete(key []byte) error
  • func (db *MemDatabase) Get(key []byte) ([]byte, error)
  • func (db *MemDatabase) Has(key []byte) (bool, error)
  • func (db *MemDatabase) Keys() [][]byte
  • func (db *MemDatabase) Len() int
  • func (db *MemDatabase) NewBatch() Batch
  • func (db *MemDatabase) Put(key []byte, value []byte) error
• type NewDatabaseFunc
• type NewDatabaseOptions
• type Putter
• type SegmentedDatabase
  • func NewSegmentedDatabase(path string) (*SegmentedDatabase, error)
  • func (db *SegmentedDatabase) Close()
  • func (db *SegmentedDatabase) CreateSegmentIfNotExists(num uint64) (*DatabaseSegment, error)
  • func (db *SegmentedDatabase) Delete(key []byte) error
  • func (db *SegmentedDatabase) Get(key []byte) ([]byte, error)
  • func (db *SegmentedDatabase) Has(key []byte) (bool, error)
  • func (db *SegmentedDatabase) Put(key, value []byte) error
  • func (db *SegmentedDatabase) Segment(num uint64) *DatabaseSegment

Constants

const IdealBatchSize = 100 * 1024

Code using batches should try to add this much data to the batch. The value was determined empirically.

Variables

var (
	ErrInvalidSegmentFilename = errors.New("invalid segment filename")
)

var OpenFileLimit = 64

Functions

func FormatSegmentFilename

func FormatSegmentFilename(blockNumber uint64) string

FormatSegmentFilename returns a segment filename.

func KeyBlockNumber

func KeyBlockNumber(key []byte) (num uint64, ok bool)

KeyBlockNumber returns the block number for a given key and returns ok true. If the key does not encode the block number then ok is false.

func ParseSegmentFilename

func ParseSegmentFilename(filename string) (uint64, error)

ParseSegmentFilename returns a block number for a given segment filename.

Types

type Batch

type Batch interface {
	Putter
	Deleter
	ValueSize() int // amount of data in the batch
	Write() error
	// Reset resets the batch for reuse
	Reset()
}

Batch is a write-only database that commits changes to its host database when Write is called. Batch cannot be used concurrently.

func NewTableBatch

func NewTableBatch(db Database, prefix string) Batch

NewTableBatch returns a Batch object which prefixes all keys with a given string.

type Database

type Database interface {
	Putter
	Deleter
	Get(key []byte) ([]byte, error)
	Has(key []byte) (bool, error)
	Close()
	NewBatch() Batch
}

Database wraps all database operations. All methods are safe for concurrent use.

func NewTable

func NewTable(db Database, prefix string) Database

NewTable returns a Database object that prefixes all keys with a given string.

type DatabaseSegment

type DatabaseSegment struct {
	// contains filtered or unexported fields
}

DatabaseSegment represents data for single block number.

func NewDatabaseSegment

func NewDatabaseSegment(blockNumber uint64, db Database) *DatabaseSegment

NewDatabaseSegment returns a new instance of DatabaseSegment.

type Deleter

type Deleter interface {
	Delete(key []byte) error
}

Deleter wraps the database delete operation supported by both batches and regular databases.

type LDBDatabase

type LDBDatabase struct {
	// contains filtered or unexported fields
}

func NewLDBDatabase

func NewLDBDatabase(file string, cache int, handles int) (*LDBDatabase, error)

NewLDBDatabase returns a LevelDB wrapped object.

func (*LDBDatabase) Close

func (db *LDBDatabase) Close()

func (*LDBDatabase) Delete

func (db *LDBDatabase) Delete(key []byte) error

Delete deletes the key from the queue and database

func (*LDBDatabase) Get

func (db *LDBDatabase) Get(key []byte) ([]byte, error)

Get returns the given key if it's present.

func (*LDBDatabase) Has

func (db *LDBDatabase) Has(key []byte) (bool, error)

func (*LDBDatabase) LDB

func (db *LDBDatabase) LDB() *leveldb.DB

func (*LDBDatabase) Meter

func (db *LDBDatabase) Meter(prefix string)

Meter configures the database metrics collectors and

func (*LDBDatabase) NewBatch

func (db *LDBDatabase) NewBatch() Batch

func (*LDBDatabase) NewIterator

func (db *LDBDatabase) NewIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator

func (*LDBDatabase) Path

func (db *LDBDatabase) Path() string

Path returns the path to the database directory.

func (*LDBDatabase) Put

func (db *LDBDatabase) Put(key []byte, value []byte) error

Put puts the given key / value to the queue

type MemDatabase

type MemDatabase struct {
	// contains filtered or unexported fields
}

* This is a test memory database. Do not use for any production it does not get persisted

func NewMemDatabase

func NewMemDatabase() *MemDatabase

func (*MemDatabase) Close

func (db *MemDatabase) Close()

func (*MemDatabase) Delete

func (db *MemDatabase) Delete(key []byte) error

func (*MemDatabase) Get

func (db *MemDatabase) Get(key []byte) ([]byte, error)

func (*MemDatabase) Has

func (db *MemDatabase) Has(key []byte) (bool, error)

func (*MemDatabase) Keys

func (db *MemDatabase) Keys() [][]byte

func (*MemDatabase) Len

func (db *MemDatabase) Len() int

func (*MemDatabase) NewBatch

func (db *MemDatabase) NewBatch() Batch

func (*MemDatabase) Put

func (db *MemDatabase) Put(key []byte, value []byte) error

type NewDatabaseFunc

type NewDatabaseFunc func(NewDatabaseOptions) (Database, error)

NewDatabaseFunc represents a function for generating a new database.

type NewDatabaseOptions

type NewDatabaseOptions struct {
	Path string // on-disk path
}

NewDatabaseOptions represents options passed to NewDatabaseFunc.

type Putter

type Putter interface {
	Put(key []byte, value []byte) error
}

Putter wraps the database write operation supported by both batches and regular databases.

type SegmentedDatabase

type SegmentedDatabase struct {

	// Filename of the root database directory.
	Path string

	// Generates a new instance of Database for a segment.
	NewDatabase NewDatabaseFunc
	// contains filtered or unexported fields
}

SegmentedDatabase represents a database segmented by block number. Each segment contains data for a different block number.

func NewSegmentedDatabase

func NewSegmentedDatabase(path string) (*SegmentedDatabase, error)

NewSegmentedDatabase returns a new instance of SegmentedDatabase.

func (*SegmentedDatabase) Close

func (db *SegmentedDatabase) Close()

Close closes all global and segment databases.

func (*SegmentedDatabase) CreateSegmentIfNotExists

func (db *SegmentedDatabase) CreateSegmentIfNotExists(num uint64) (*DatabaseSegment, error)

CreateSegmentIfNotExists finds or creates a segment by block number.

func (*SegmentedDatabase) Delete

func (db *SegmentedDatabase) Delete(key []byte) error

Delete deletes the key from database.

func (*SegmentedDatabase) Get

func (db *SegmentedDatabase) Get(key []byte) ([]byte, error)

Get returns the value of a given key.

func (*SegmentedDatabase) Has

func (db *SegmentedDatabase) Has(key []byte) (bool, error)

Has returns true if key exists.

func (*SegmentedDatabase) Put

func (db *SegmentedDatabase) Put(key, value []byte) error

Put writes the key/value pair to the database.

func (*SegmentedDatabase) Segment

func (db *SegmentedDatabase) Segment(num uint64) *DatabaseSegment

Segment finds a segment by block number.